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All Journal International Journal of Electrical and Computer Engineering
Winai Jaikla
King Mongkut's Institute of Technology Ladkrabang
Computer Science & IT Electrical & Electronics Engineering

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One input voltage and three output voltage universal biquad filters with orthogonal tune of frequency and bandwidth May Phu Pwint Wai; Amornchai Chaichana; Winai Jaikla; Surapong Siripongdee; Peerawut Suwanjan
International Journal of Electrical and Computer Engineering (IJECE) Vol 11, No 4: August 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v11i4.pp2962-2973

Abstract

This research paper contributes the one input three output voltage mode universal biquad filters with linear and electronic control of the natural frequency (w0), using two commercially available ICs, LT1228s as active device with two grounded capacitors, five resistors. The presented universal biquad filters can simultaneously provide three voltage-mode filtering functions, low-pass (LP), high-pass (HP) and band-pass (BP) without changing the circuit architecture. Furthermore, the first presented biquad filter provides low impedance at HP, BP voltage output nodes and LP, BP output voltage nodes are low impedance for the second proposed filter which is easy cascade ability with other voltage mode circuits without the employment of buffer circuits. The quality factor (Q) of both proposed filters is orthogonally adjusted from the passband voltage gain and w0. The proposed filters are simulated and experimented with commercially accessible ICs, LT1228. The simulated and experimental results demonstrate the filtering performances.
Co-Authors Amornchai Chaichana May Phu Pwint Wai Peerawut Suwanjan Surapong Siripongdee